It was the Thirteenth Amendment which abolished slavery.
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Passed by Congress on January 31, 1865, and ratified on December 6, 1865, the 13th amendment abolished slavery in the United States. The 13th amendment, which formally abolished slavery in the United States, passed the Senate on April 8, 1864, and the House on January 31, 1865.
The amendment that Congress passed in 1865 was the Thirteenth amendment and it banned slavery in the United States.
The official abolition of slavery didn't come until much later. It was abolished during the 13th Amendment which was ratified on January 31, 1865.
The Thirteenth Amendment, passed in December of that year.
The 13th amendment to the US Constitution was passed by Congress on January 31, 1865, and ratified by the states December 6, 1865. See the link below.